Machine for galvanizing sheet or plate metal



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J. PATON. MAGEINE FOR GALVANI'ZING SHEET 0E PLATE METAL. No. 414,951. Patented Nov. 12, 1889.

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MACHINE FOR GALVAN'IZING SHEET QR PLATE MET-AL.

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Patented Nov; 12, 18-89.

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' UNITED A STATES:

PATENT OFFICE.

JAMES PATON, OF CLEVELAND, OHIO.

MACHINE FOR GALVANIZING SHEET OR PLATE METAL.

SPECIFICATION forming part of Letters Patent No. 414,951, dated November 12, 1889.

' Application filed March 27, 1889. Serial No. 305,025. (No model.)

.plete description thereof.

My invention relates to a machine or apparatus for galvanizing sheet or plate metal; and the improvement consist-s in the application of a skimming device in connection therewith, thepurpose of which is to free the surface of the molten zinc or tin from the oxide and impurities thereof at that part where the plates are drawn from out the molten metal.

That the invention may be fully seen and understood, reference will be had to the following specification and accompanying drawings, in which Figure 1 is a vertical longitudinal section of a galvanizing pot or vat provided with the improvement above referred to. Fig. 2 is a partial plan view of the same. Fig. 3 is an end view of said pot or vat with the improvements attached; and Fig. 4 is a transverse vertical section of the same, looking toward the end and illustrated in Fig. 2.

Like letters of reference refer to like parts in the drawings and specification.

In all the figures the pot or vat A is shown as detached from the furnace into which it is set or by which it is surrounded, for the purpose of melting the zinc, tin, lead, or other suitable metal placed thereon, and to keep said metal in a proper molten state for coating the immersed sheet or plate of metal. It is well known that in the galvanizing process of plate or sheet metal sal-ammoniac is required as an agent in the process. The sal-ammoniac thrown into the vat will remain in form of a liquid layer on top of the molten zinc. Thus all the sheet or plate metal has to pass through said layer of sal-amnioniac before it can be immersed into the zinc bath. However, on withdrawing the thus-coated sheet of metal it is of vital importance that the surface of the molten zinc should be free from all deposits and impurities, so that nothing can adhere to said sheet but the clear zinc, which, when left undisturbed while cooling,- will greatly improve the appearance of the sheet by. a glossy and pronounced crystalliza= tion with a more uniform coating by pass.- ing out from the clean metal.

To obtain a clear surface of zinc of the required extent or space through which the sheets are drawn from the zinc bath, a skim- 6o ming device of the following construction is employed: The devices substantially consist of a pair of metallic rolls B and B and suitable bearings, guides, and gearings for sus-' pending, adjusting, and revolving said rolls in the manner as hereinafter set forth. The bearings of said rolls B B are seen ata, 1), Figs. 1 and 2, which bearings project inwardly from the lower part c of the slide O. Both the lower part c and upper part c are united by means of bolts or rivets and thus form the slide 0, which is located between the guides D D. To the angle-plates E E, at either end of the vat A, is bolted the bottom plate F of said guides D D, as seen in Figs. 2 and 3. The angle-plate E, as well as the bottom plates F, have elongated holes in the face sides thereof, as seen at 9, so as to enable proper adjustment of the guides D D in relation to the rolls B B. Each of said slides is provided with a lug (1, into which is threaded a spindle G, Figs. 1 and 2. The spindles rest upon the plate F, and when turned carry the rolls B B either up or down, as seen in Figs. 1 and 4. The rotation of the rolls is caused by the gearing H J and I I from the gear H, motion being imparted to the gears I I by means of the intermediate gear J that is, if the gear H is rotated in direction of the arrow, then the gears I I will be turned so as to rotate the rolls B 'B' in opposite direction. The spindle K, carrying the gear 11, may either be turned by hand or by means of a crank, or motive power may be applied ona pulley se cured to said spindle. The intermediate gear J allows the lowering of the rolls B B more or less into the vat A, whilev the spindle K, with the gear H, may yet be far enough above the vat to enable the turning of said spindle. The raising or lowering of the rolls B B is [00 done by means of the spindles G G, as above stated, which adjustment is necessary accord ing to the variations of the levelof the molten zinc within the vat. \Vhen in operation, said rolls should be immersed in the metal to about the extent as indicated in Fig. i, wherein (2 denotes the level of the zinc, and f the layer ohsal-ammoniac. In rotating the rolls in that position and in the direction as above stated all the impurities which may either be expelled in melting the zinc or may have been in combination with the sal-ammoniac rise to the surface between the rolls and are taken up by said revolving rolls and carried by the same over to the opposite side of said rolls, thus effecting between the rolls a space of molten zinc, the surface of which is entirely freed from all oxides or other impurities.

The sheets or plates can be sunk into the molten metal from either side of the vat 011 the outside of the rolls by means of suitable guides and hooks, the immersed sheets being then pushed under and lifted when between the rolls for withdrawal from the molten zinc, during which time the rolls are continuously revolved for the purpose, as above stated. The bearings of the rolls I I are within the heated metahand are thus exposed to the action of the zinc, which will corrode or disin tegrate the slide 0 at that part long before the upper parts become worn out. Thus said thereof. \Vhen the operation of the vat is suspended, the rolls are lifted from out the zinc, which maybe done by turning the crankhandle L of the screws G G; or the slide and rolls may be entirely lifted out of the guides I) D,in which case the holes g in the slides C 0 permit the use of a hook or withdrawal attachments for such renewal.

What I claim as my invention, and desire to secure by Letters Patent, is-- 1. In combination, a vat, slides 0, held by suitable guides, rolls having their hearings in said slides, and threaded spindles G, in connection with the slides for adjusting the same vertically, and means for driving the rolls, also carried by the slides and adjustable therewith, substantially as described.

2. In combination, a vat, slides supported thereon in guides, rolls supported in bearings carried by said slides, a lug on each slidehaving a screw-threaded opening, and threaded spindles G, passing through said lugs for adjusting the rolls vertically, with means for operating the rolls, substantially as described.

3. In combination with a vat, the slide consisting of two parts, thelower part being provided with bearings for rolls, gearing supported by the slides for driving the rolls, and means for adjusting the slides vertically.

In testimony whereof I affix my signature in presence of two witnesses.

. JAMES PATON.

Witnesses:

W. II. BURRIDGE, L. B. Bnnmnen. 

